create_faf4_annual_truckloads: Create annual truckload equivalents from FAF v4+ regional...

In rickdonnelly/pcvmodr: Portable version of Oregon TLUMIP Commercial Vehicle (CV) model

Description

Create annual truckload equivalents from FAF v4+ regional flow database

Usage

create_faf4_annual_truckloads(faf_flows, load_consolidation_factor = 1)

Arguments

faf_flows	Data frame containing the FAF interregional flows for the analysis year, usually derived by applying preprecessor function(s) on FHWA database for the desired target year.
load_consolidation_factor	Numeric value representing the potential for two or more commodity flows to be consolidated into single truck for delivery (default = 1.0)

Details

This function converts the commodity flows, measured in annual tons and value between FAF regions, into truckload equivalents. The five-step method described in the "FAF4 Freight Traffic Analysis" report is currently implemented, and the user should consult that documentation to understand the data requirements and methods used. The translation is deterministic, for it uses tables of proportions by vehicle type, body style, commodity, and trade type to arrive at one or more discrete annual truck trips by each of those indices, between each set of FAF regions that have commodity flows coded in the data. The result is a new, and much larger, data frame containing the number of truck trips for each inter- regional flow pair in the FAF data.

Examples

annual_trucks <- create_faf4_annual_truckloads(faf_database)

rickdonnelly/pcvmodr documentation built on May 14, 2019, 8:17 a.m.